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Half of a zone wont turn on

Help! Half of our zone 3 (grass area in the back yard) wont turn on. We have tried looking for wet spots and leaks and have dug up all remaining sprinklers on the lines back to the last working sprinkler head....and no leaks or cracks seen...now what? Any advice would be appreciated!

If it's pvc look for a clog at the last working sprinkler. The tee might be clogged on the outgoing port.
If you can't find a clog there then try running water backwards down the line. Attach the hose to one of the fittings where the non working sprinkler is. Maybe even cut the pipe and attach the hose there. You might have to ram something down the pipe to loosen the clog once you find it.

If it's poly pipe then it's probably pinched off somewhere.

Are you certain that all the sprinklers are connected to just 1 valve? Maybe two valves are wired together and one isn't working.